CN103344911B - A kind of high-voltage direct-current switch disconnection overall process state identification method - Google Patents

A kind of high-voltage direct-current switch disconnection overall process state identification method Download PDF

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CN103344911B
CN103344911B CN201310290857.7A CN201310290857A CN103344911B CN 103344911 B CN103344911 B CN 103344911B CN 201310290857 A CN201310290857 A CN 201310290857A CN 103344911 B CN103344911 B CN 103344911B
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current
oscillation circuit
waveform
switch
voltage direct
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CN103344911A (en
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袁佳歆
孙彬
蔡超
陈柏超
周兴隆
李小平
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Wuhan University WHU
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Wuhan University WHU
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Abstract

The invention provides a kind of high-voltage direct-current switch disconnection overall process state identification method, does it adopt Hall element noncontact obtain the current waveform of oscillation circuit when high-voltage direct current switch disconnects and use German BECKHOFF? after PAC gathers, by also using Fourier transform and wavelet theory etc. to each section of waveform labor to oscillation circuit current waveform in time shaft segmentation, according to the catastrophe point in the frequency change of electric current and waveform, judge in high-voltage direct-current switch disconnection overall process, detailed current transfer process and oscillation circuit, isolating switch, the working condition in energy-absorbing loop.The present invention is highly sensitive, degree of accuracy is high, can be implemented in line analysis function.

Description

A kind of high-voltage direct-current switch disconnection overall process state identification method
Technical field
The invention belongs to the circuit breaker arc analysis technical field of HVDC (High Voltage Direct Current) transmission system mesohigh DC switch, particularly a kind of high-voltage direct-current switch disconnection overall process state identification method.
Background technology
Since the end of the eighties, the research of China's HVDC Transmission Technology is advanced by leaps and bounds, and has domesticly at present put into operation 500kV DC transmission engineering has more than ten bars.The DC engineering that China plans to put into operation before the year two thousand twenty will more than 30; Simultaneously just carrying forward vigorously comprising to realize " transferring electricity from the west to the east " strategic country 400kV, 660kV, 800kV and the construction of the high pressure such as 1000kV and extra-high voltage direct-current transmission engineering, following direct current transportation will become the important component part of China's electrical network.
DC switch is one of key equipment of current conversion station in DC transmission engineering, and its Main Function is the method for operation of change straight-flow system and knows the fault occurred in circuit in time.The DC switch of each large current conversion station installing of Present Domestic mainly contains metallic(return) circuit switch (MetallicReturnTransferBreaker, MRTB), ground return circuit switch (GroundReturnTransferSwitch, GRTS), neutral bus switch (NeutralBusSwitch, and neutral bus grounding switch (NeutralBusGroundSwitch, NBGS) etc. NBS).
DC switch is compared with alternating-current switch, and the electric current that DC switch passes through is DC current, and not having can the current zero-crossing point of direct extinguish arcs.Therefore, existing DC switch system is on alternating-current switch, install the oscillation circuit comprising reactor and capacitor and form additional mostly, the high frequency oscillating current produced by oscillation circuit realizes switch fracture current over-zero, thus makes arc extinction, finally successfully realizes cut-offfing of DC switch.
Under normal circumstances, the overall process of cut-offfing of high-voltage direct current switch is divided into three phases: (1) forces the flame current zero passage stage; (2) the breaker fracture medium recovery stage; (3) the lightning arrester group action energy-absorbing stage, but in actual applications due to the change of its condition of work, there is oscillation circuit, SF6 switch can not effectively coordinate to such an extent as to the problem of failure of interruption with parts such as lightning arrester groups, very big economic loss is caused to straight-flow system.Owing to lacking reliable technological means, true switching-state information during high-voltage direct current switch on-line operation cannot be grasped at present, for the safe and stable operation of high voltage direct current project of transmitting and converting electricity leaves hidden danger.
Hubei Province Electric Power Test Research Institute proposes a kind of measuring method of oscillation circuit parameter, by judging the working condition of oscillation circuit to the measurement of oscillation circuit parameter, and has been widely applied in the site test of DC switch.This method must be detect the parameter of oscillation circuit under the mode of off-line, can not obtain high-voltage direct current switch state and the information of cut-offfing overall process online.
Summary of the invention
The present invention mainly solves and directly cannot measure isolating switch branch current problem existing for prior art; Provide a kind of indirectly to high-voltage direct current switch state analysis method, namely judge high-voltage direct-current switch disconnection overall process multidate information by carrying out analysis to the change of current waveform frequency in high-voltage direct current switch oscillation circuit and sudden change moment, and then infer each loop works state of high-voltage direct current switch.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:
A kind of high-voltage direct-current switch disconnection overall process state identification method, comprises the following steps:
Step 1, gathers oscillation circuit current waveform;
Step 2, observes oscillation circuit electric current and whether occurs high-frequency current signal, if so, then illustrates that oscillation circuit is connected to isolating switch loop; If not, then oscillation circuit is connected to isolating switch loop; And use Fourier transform to carry out spectrum analysis to waveform, whether normally calculate oscillation circuit resistance, inductance and capacitance parameter;
Whether step 3, if high-frequency current signal appears in step 2, analyze oscillation circuit electric current with wavelet theory and undergo mutation, if undergo mutation, then illustrates that contact of breaker pulls open and produces electric arc; If not, then illustrate that isolating switch does not normally work;
Step 4, it is slow that observation oscillation circuit electric current occurs whether high-frequency current signal flattens, and be rendered as slow downward trend, if so, then illustrate that electric arc extinguishes, and DC current transfers to oscillation circuit; If not, illustrate that electric arc does not extinguish.
Step 5, observes current waveform and whether enter a process of suddenly falling after waveform mild in step 4, and if so, lightning arrester group action energy-absorbing is then described, current transfer is to energy-absorbing loop; If not, then illustrate that lightning arrester group does not normally work.
In described step 3, utilize the small echo instrument in MATLAB, before and after intercepting oscillation circuit electric current oscillation starting points, two to three periodic waveforms carry out wavelet decomposition, after db5 small echo 5 layers decomposes, judge whether last one deck obtains a high fdrequency component again, namely the appearance of high fdrequency component shows to there occurs sudden change.
In described step 1, the process gathering oscillation circuit current waveform is: first use Hall current sensor that current signal is transformed into voltage signal, then uses German BECKHOFFPAC harvester to gather voltage signal.
Compared with prior art, tool of the present invention has the following advantages:
1. present invention, avoiding and isolating switch branch current is analyzed, and cleverly by catching the change of oscillation circuit electric current, and then the multidate information of reflection high-voltage direct current switch overall process;
2. wavelet theory of the present invention extracts the high fdrequency component of electric current, sensitiveer than the signal processing method of routine;
3. the present invention uses Hall current sensor and PAC to gather, more accurate than the harvester of routine;
4. the present invention can be implemented in line analysis function.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is active high voltage direct current switch structural drawing;
Fig. 3 is off-line type oscillation circuit measurement method of parameters schematic diagram;
Fig. 4 is oscillation circuit current simulations oscillogram;
Fig. 5 is arcing point wavelet analysis figure.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As Fig. 1, after using Hall element and PAC to gather oscillation circuit current waveform, first by analyzing oscillation circuit electric current, whether starting of oscillation judges oscillation circuit action situation; Then whether undergo mutation with wavelet theory analysis oscillating current attenuation coefficient and judge whether to produce circuit; After this analyze current waveform more whether flatten slow and be rendered as slow downward trend to judge electric arc and whether extinguish and whether DC current transfers to oscillation circuit; Whether ultimate analysis electric current falls to judge lightning arrester group whether action energy-absorbing and whether electric current transfers to energy-absorbing loop suddenly.
As Fig. 2, oscillation circuit is made up of high-voltage alternating SF6 isolating switch CB, Capacitor banks C, reactor L, resistance R and oscillation circuit switch S 1.Charge circuit switch S 2 controls charge circuit and charges to capacitor C, the size of C determines the escalating rate of recovery voltage, its Selecting parameter should guarantee that the medium recovery speed of switch is greater than the ascending velocity of recovery voltage, and make breaker fracture both end voltage change will lower than the tolerant value of isolating switch simultaneously.The value of L is relevant with the value of electric capacity C, and lower L value can reduce the maximum of switch can dropout current, and excessive L may extend switch off time, cut-offs bring adverse effect to DC current.Zinc-Oxide Arrester group MOV is used for limiting circuit breaker two ends superpotential size, and the energy discharged in interrupting process is absorbed as main power-absorbing, its volt-ampere characteristic flex point determines the changing voltage of DC switch, and switching current and conversing circuits impedance determine the rated capacity of Zinc-Oxide Arrester group.
As Fig. 3, E is DC charging voltage, it is that AC voltage regulator output voltage obtains after rectification, for Zinc-Oxide Arrester group, C and L is respectively tank circuit inductance and reactance, and S1 is oscillation circuit switch, S2 is that DC circuit breaker cut-offs element, R1 is the noninductive shunt resistance meter of low-resistance, and SW1 is charge circuit switch, and SBQ is digital storage oscilloscope.
First capacitor voltage at both ends is charged to about 300V during site test, then charge circuit interrupteur SW 1 is disconnected, and progressively closed oscillator switch S 1 and cut-off element S2, now electric capacity C is discharged by oscillation circuit, completes the record to oscillation circuit electric current by shunt resistance meter and oscillograph.The weak point of said method is mainly reflected in the following aspects:
(1) be to know the capacitor value of Capacitor banks according to the prerequisite of test current waveshape inductance L and resistance R, workload is large, and the parameter value accuracy recorded is not high enough.
(2) only judge oscillation circuit duty by measurement result, and cannot judge other loop states of high-voltage direct current switch.
As Fig. 4, when high-voltage direct current switch regular event, electric current from 0 rapidly starting of oscillation, oscillation circuit action is described; Then undergo mutation as Fig. 5 analyzes known current waveform, illustrate that oscillatory extinction coefficient changes, electric arc produces; In the vibration later stage, electric current enters a mild stage, and this is to the process of capacitor charging, and illustrate that electric arc extinguishes, DC current transfers to oscillation circuit; Suddenly fall before reaching zero at the after-current in mild stage, illustrate that capacitance voltage has reached lightning arrester group operation voltage, lightning arrester group action conducting, current transfer is to energy-absorbing loop.
As Fig. 5,20100 data segments between getting corresponding to 0.1998s-0.2100s carry out wavelet analysis.Having there is high fdrequency component at the 300th data point place in the waveform after db5 wavelet decomposition, illustrates that sudden change produces herein.

Claims (1)

1. a high-voltage direct-current switch disconnection overall process state identification method, is characterized in that: comprise the following steps:
Step 1, gathers oscillation circuit current waveform;
Step 2, observes oscillation circuit electric current and whether occurs high-frequency current signal, if so, then illustrates that oscillation circuit is connected to isolating switch loop; If not, then oscillation circuit is not connected to isolating switch loop; And use Fourier transform to carry out spectrum analysis to waveform;
Whether step 3, if high-frequency current signal appears in step 2, analyze oscillation circuit electric current with wavelet theory and undergo mutation, if undergo mutation, then illustrates that contact of breaker pulls open and produces electric arc; If not, then illustrate that isolating switch does not normally work;
Step 4, it is slow that observation oscillation circuit electric current occurs whether high-frequency current signal flattens, and be rendered as slow downward trend, if so, then illustrate that electric arc extinguishes, and DC current transfers to oscillation circuit; If not, illustrate that electric arc does not extinguish;
Step 5, observes current waveform and whether enter a process of suddenly falling after waveform mild in step 4, and if so, lightning arrester group action energy-absorbing is then described, current transfer is to energy-absorbing loop; If not, then illustrate that lightning arrester group does not normally work;
In described step 3, utilize the small echo instrument in MATLAB, before and after intercepting oscillation circuit electric current oscillation starting points, two to three periodic waveforms carry out wavelet decomposition, after db5 small echo 5 layers decomposes, judge whether last one deck obtains a high fdrequency component again, namely the appearance of high fdrequency component shows to there occurs sudden change;
In described step 1, the process gathering oscillation circuit current waveform is: first use Hall current sensor that current signal is transformed into voltage signal, then uses German BECKHOFFPAC harvester to gather voltage signal.
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CN106772025A (en) * 2016-11-30 2017-05-31 国家电网公司 A kind of breaking capacity of breaker appraisal procedure based on total current equivalence principle
US20200371160A1 (en) * 2017-04-21 2020-11-26 Cps Technology Holdings Llc Battery electromechanical switching device diagnostics system and methods
CN109270383B (en) * 2018-11-08 2021-01-05 国网江西省电力有限公司电力科学研究院 Non-invasive charging pile automatic detection method

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